Why not get both? They're both good lenses. If you are unsure which is for you, maybe do a search of your current photos to see if you're favouring one focal length over another. Personally, I find 24mm a very versatile focal length. Good for group shots. Plus, you can take a full body photo of someone in which they take up a reasonably large part of the frame and you can still get some good background detail (or bridesmaids/family) in. But if you're getting in very close, the 35mm, might give you slightly more pleasing results.